From the problem, the initial point is at (0, 0) which is on the ground, the target is 60 feet away and the maximum height is 45 feet which is in midway between the initial point and the target point.
a. The coordinates of the second point on the ground is (60, 0)
b. The point on the parabola that shows the highest point is (30, 45)
c. The vertex is the highest point on the graph which is also have the coordinates of
(30, 45)